ci: run checks on pull requests

[KidkArolis]

Summary

• run the existing test, lint, format, build, and package checks on pull requests
• install locked dependencies with npm caching on Node.js 24
• cancel superseded runs and keep workflow permissions read-only

Verification

• npm test

[cursor]

Risk: low. Approved this pull request; Cursor Bugbot completed with no findings and the CI check passed. No reviewers were assigned.

  

_{Sent by Cursor Approval Agent: Pull Request Router and Approver - Risk Based}